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<p>
  Defines a parameter that specifies how a Copy Artifact build step should select which
  build to copy from.  Note that this parameter type is easier to use when starting the
  build from a browser; to specify a value via direct HTTP POST or the CLI, valid XML
  must be given.
</p>
<p>
  Be aware that this string value is encoded selector configuration,
  and not compatible with different plugin versions.
</p>
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